Abstract: In an acoustic transducer of the present invention, a connecting part connects a housing and a support of the housing, such that a user's auricle is pinched between the housing and the support cooperatingly. Two hooks shaped into a circular arc embracing a constricted part of the auricle therebetween fix the support. These two hooks are connected such that a gap therebetween can be changed or adjusted.

Abstract: A cover apparatus of a cassette tape recorder comprising first and second covers rotatable to be openable and closable with respect to a body of the tape recorder, the first cover having a holder to encase a tape cassette so that the tape cassette encased in the cassette holder is rotatable in accordance with the rotation of the first cover. The first and second covers are coupled to each other through a slider engaged with the second cover and slidable along a side surface of the first cover. The first cover rotates to cover the entire tape cassette in cooperation with the second cover when the second cover is closed with respect to the tape recorder body.

Abstract: A cassette tape recorder cabinet has an upper cabinet part and a lower cabinet part between which a mechanism base plate is provided to hold a tape cassette inserted into the recorder to drive a tape encased in the tape cassette. The upper and lower cabinet parts have respective front surfaces facing a tape-exposing side of the tape cassette and rear surfaces positioned opposite the front surfaces. The height of the front surface of the upper cabinet part is greater than that of the rear surface thereof, and the height of the front surface of the lower cabinet part is smaller than that of the rear surface thereof.

Abstract: A radio receiver set having a rotary antenna device comprises a rotary body rotatably mounted to a top plate of a cabinet forming the radio receiver set, and an antenna housing case mounted to the rotary body in a manner which allows the adjustment of elevation angle, the antenna housing case being provided with holding means to retain a selected elevation angle position, whereby a maximum receiving sensitivity can be attained only by rotating said antenna housing case while it is held in a selected elevation angle with respect to the rotary body.